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This page documents the setup of a Linux system for screencasting | This page documents the setup of a Linux system for screencasting | ||
== Show Keyboard commands == | ==On Screen Display== | ||
When showing software it's usefull for the students to see which keyboard shortcuts are pressed. | === Show Keyboard commands === | ||
sudo | When showing software it's usefull for the students to see which keyboard shortcuts are pressed. You can use screenkey, an on screen display (OSD) which should be installed like this: [https://gitlab.com/screenkey/screenkey/-/issues/111 (Don't install from repository)] | ||
will install the screenkey application. Run | git clone https://gitlab.com/screenkey/screenkey.git | ||
cd screenkey | |||
sudo ./setup.py install | |||
will install the screenkey application. Run with screenkey | |||
[[File:Screenkey.png]] | [[File:Screenkey.png]] | ||
Make sure to check "Show modifier sequences only" otherwise everyone can read your password inputs... | |||
=== Show Mouse Clicks === | |||
There is a feature branch in the screenkey git which implements that, hopefully it will be merged into master once you read this. | |||
== Using v4l2loopback to stream in and out of OBS == | |||
Load the v4l2loopback kernel module and create two devices. | |||
modprobe v4l2loopback devices=2 video_nr=10,9 card_label="OBS Output","Canon 5D" exclusive_caps=1 | |||
=== Stream Canon 5D via USB === | |||
gphoto2 --stdout --capture-movie | gst-launch-1.0 fdsrc fd=0 ! decodebin name=dec ! queue ! videoconvert ! tee ! v4l2sink device=/dev/video9 | |||
[https://stackoverflow.com/questions/12278688/canon-dslr-video-loop-back-using-v4l2loopback-and-edsdk-liveview Source] | |||
=== Stream from OBS to a virtual camera source === | |||
We can't stream directly from OBS into Jitsi, BigBlueBitton, Google Meet, Skype, etc. So we are using v4l2loopback for this. | |||
To install the v4l2sink for OBS follow these steps: | |||
apt install qtbase5-dev | |||
git clone --recursive https://github.com/obsproject/obs-studio.git | |||
git clone https://github.com/CatxFish/obs-v4l2sink.git | |||
cd obs-v4l2sink | |||
mkdir build && cd build | |||
cmake -DLIBOBS_INCLUDE_DIR="../../obs-studio/libobs" -DCMAKE_INSTALL_PREFIX=/usr .. | |||
make -j4 | |||
make install | |||
In OBS, go to Menu → Tools → V4L2 Video Output | |||
[[File:V4L2 Video Output.png]] | |||
In BigBlueButton (or any other videoconferencing service) Select the virtual "OBS Output" as a video source. | |||
[https://srcco.de/posts/using-obs-studio-with-v4l2-for-google-hangouts-meet.html Source] | |||
== Wishlist == | |||
https://www.blackmagicdesign.com/products/intensitypro4k |